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FOSS - Protein Analyzer - Kjeltec™ 8400

This fully automated Kjeldahl analyser is a highly versatile distillation and titration instrument, using the global reference method for protein determination. Ensures optimal throughput and the highest safety standards for use in any laboratory.


Fully automated (distillation, colorimetric titration, calculation). Upgradeable to auto sampler. Easy data handling with Compass software.

Sample type

Feed, feed ingredients, forage, pet food, grain, cereal, oil seeds, meat, meat products, milk, dairy products, beer and beer ingredients.


Nitrogen, protein, Non Protein Nitrogen (NPN) and volatiles (TVBN and more).

Technical specification

Performance data at 230 V
Autosampler capacity Kjeltec™ sampler 8420, 1 rack with 20 Kjeldahl tubes 250 ml or 400 ml
Kjeltec™ sampler 8460, 3 racks with 20 Kjeldahl tubes 250 ml or 400 ml
Analysis time 3.5 minutes at 30 mg N (6.5 minutes at 200 mg N)
Distillation capacity ~ 40 ml/min
Measuring range 0.1 – 200 mg N
Reproducibility 1% RSD (including the digestion step)
Installation requirements
Power supply 200 – 240 V 50 – 60 Hz
Tolerable voltage variation ± 10 %
Power consumption 2 200 W
Water consumption (during distillation only) 3 l/min at water temp of 25°C
*1 l/min at water temp of 15°C
* Circulating Cooler recommended at >25°C
Weight net 35kg
Dimensions: (W×D×H) 480 × 580 × 690 mm

Key features

Unmatched Accuracy

The superior performance of a KjeltecTM titration system is based on colorimetric measurement of a precise chemical reaction for end-point detection. Accuracy is assured time after time with the additional benefits of long-term stability, wide working range, speed and simplicity without the need for repeated and costly calibration procedures.

Safety features

A fast tube draining system removes the need for handling hot reagents after distillation. Interlocked safety door which must be closed with a tube in place before the unit will operate. Cooling water flow is controlled automatically and a temperature sensor stops the unit if the distillate is too hot. Sensors monitor tube in place, safety doors, reagent levels, water level and over-pressure in the steam generator providing safe use. 


An optional 20 or 60 place Autosampler provides the benefits of automation even at lower sample throughputs. Just load your sample racks directly from the digestion block and KjeltecTM will perform accurate analysis unattended for more than four hours.


The patented SAfE* technology improves safety by a mixing procedure, reducing the exothermic reaction between alkali and acid during distillation and removing the need for manual pre-dilution.
 *Steam Addition for Equilibration

Kjeltec™ 8400 – fully automated Kjeldahl analysis

  • Biopharmaceutical and Biotechnology
  • Education & Academics
  • Environmental
  • Food & Beverage
  • Pharmaceutical
Foss Analytical

FOSS creates end-to-end solutions that secure and improve food quality. From raw material to finished product. Our analysis instruments refine measurements into information management that enables businesses to run intelligent data-driven productions with less waste and bigger yields. Controlling cost and quality across all sectors and value chains, we help food and agricultural producers limit the number of human errors, scale their business faster and reduce manual labor as well as labor costs. We call it analytics beyond measure.

We cover these food and agricultural industries: Dairy, Feed and Forage, Grain, Flour Milling & Oilseed Processing, Laboratories, Meat, Raw Milk Testing and Wine.

Over the last 60 years, we have made it our business to define the standard of analytical solutions for the food and agricultural industry. We pioneered advanced analysis for the challenging production environments in the 1960’s, and we were the first to integrate chemical composition analysis in process lines. Now our resolve and ambition have also made us the international benchmark in the field of chemometrics and real time analytics.

[Kjeldahl, Protein Analyzer]